Technics RS-M215 User manual

Metal Tape Compatible Stereo Cassette Deck
with FL Meters, Soft-Touch Controls and
Rewind Auto-Play Convenience
DO oxy svsrew)
RS-M24 MECHANISM SERIES
Specifications
Track system:
Tape speed:
Wow and flutter:
Frequency response:
Signal-to-noise ratio:
Fast forward and
rewind time:
Inputs:
4-track 2-channel stereo recording and playback
4.8cm/s
0.05% (WRMS), +0.14% (DIN)
Metal tape; 20—-17,000Hz
30— 15,000 Hz (DIN)
CrOz tape; +20—16,000Hz
30— 15,000 Hz (DIN)
Normal tape; 20 — 15,000 Hz
. 30— 13,000 Hz (DIN)
Dolby NR in; 66dB (above 5kHz)
Dolby NR out; 56dB
(signal level = max. recording level, CrO2 type
tape)
Approx. 90 seconds with C-60 cassette tape
MIC; sensitivity 0.25 mV, input impedance 60 kQ
applicable microphone impedance 4002— 10kQ
LINE; sensitivity 60 mV, input impedance 47 kQ
Outputs:
Rec/Pb connection:
Bias frequency:
Motor:
Heads:
Power requirements:
Power consumption:
Dimensions :
Weight :
Specifications are subject to change without notice.
+ ‘Dolby’ and the double-D symbol are trademarks of Dolby Laboratories.
Technics
ORDER NO. ARD-8012129C09
ervice Manual
Cassette Deck
RS-M215
bas Face
Black —)
This is the Service Manual for the
following areas.
For all European areas
except United Kingdom.
[B) -++----- For United Kingdom.
LINE; output level 420 mV, output impedance
1.5kQ or less, load impedance 22k 2 over
HEADPHONE ; output level 80 mV load imped-
ance 822
5P DIN type;
input sensitivity 0.25mV, impednce 5.3k2
output level 420 mV, impedance 1.5 kQ
80 kHz
Electrical DC governor motor
2-head system
1-MX head for record/playback
1-double-gap ferrite head for erasue
[D}--- AC 110/220 V, 50-60Hz (fo alll European
areas except United Kingdom)
-- AC 240V, 50Hz (only for Untecd Kingdom.)
11W
43.0cm(W) X 12.2. cm(H) x 20.6cn(D)
3.9kg
Matsushita Electric Trading €o., Ltd.
P.O. Box 288, Central Os-aka Japan

RS-M215
CONTENTS
ITEM
PAGE
LOCATION
OF
CONTROLS
AND
COMPONENTS
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1
DISASSEMBLY
INSTRUCTIONS
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set
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2
MEASUREMENT
AND
ADJUSTMENT
METHODS
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3
ELECTRICAL
PARTS
LOCATION
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6
SCHEMATIC
DIAGRAM
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senses
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eneesnses
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7
CIRCUIT
BOARDS
AND
WIRING
CONNECTION
DIAGRAM
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8
MECHANICAL
PARTS
LOCATION
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sees
test
eessese
cence
esecneeeseeaeneenseseeaeneaees
9
CABINET
PARTS
LOCATION
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9
LOCATION
OF
CONTROLS
AND
COMPONENTS
@ Power switch (power)
@ Cassette holder
@ Tape counter and Reset button (tape counter)
@ Recording indication lamp (rec)
® Fluorescent level meters
Eject button (A eject)
@ Record button (O rec-()
Rewind/Review button (4€<4 rew/rev)
Fast forward/Cue button (> P ff/cue)
Play button (Pm play-(@)
@ Stop button (I stop)
@ Pause button (|| pause)
@3 Headphone jack (phones)
Tape selector [tape select (Metal*CrO 2-normal)]
@® Dolby noise-reduction switch [Dolby NR (in-out)]
Input selector [input select (line-mic (DIN))]
@ Input level controls [input level (leftright)]
TT
a
.
Microphone
jacks
[mic
(lefteright)]
HAN
nnEOgg009
Record/Playback
connection
socket
(REC/PLAY)
—
@
Voltage
selector
(VOLTAGE
SELECTOR)
@ Line output cord (LINE OUT)
@ Line input cord (LINE IN)

DISASSEMBLY INSTRUCTIONS
* The head azimuth can be
adjusted by removing the
cassette lid.
Fig. 5
(C)
1
_ FL METER | J
SSS SS ee ee Se “I
(L) METER HOLDER}
RS-M215 RS-M215
Procedure
To remove —— .
Shown in fig. —.
Case cover
* 2 Screws
Bottom cover
Front panel
+ 5 screws
* 2 control knobs
* Cassette lid
+ 5 screws
* Binder
Back chassis
* 4 screws
* 4 binders
* Recording wire
Mechanism unit
* 4 screws
1-23-46
FL meter circuit board
* FL meter and FL meter circuit board can
be easily removed when meter holder (L)
is pushed in the direction of the arrow
shown in fig. 8.
* Binder
* Meter holder
I> 2>3>9>>/
Operation button unit
* Cassette holder
* 2 screws

RS-M215
N
D
ADJUSTMENT
M
ETHODS
NOTES:
Keep good
condition,
set
switches
and
controls
in
the
following
positions,
unless
otherwise
specified.
M
EASU
REM
ENT
A
@
Make
sure
heads
are
clean.
@
Tape
selector:
Normal
position
©
Make
sure
capstan
and
pressure
roller
are
clean.
®
Input
selector:
Line
in
ADJUSTMENT
PARTS
LOCATION
@
Judgeable
room
temperature:
20
+5°C
(68+9°F)
@
input
level
controls
:
Maximum
@
Dolby
NR
switch:
OUT
MEASUREMENT & ADJUSTMENT
Tape speed adjustment VR
Screw (A)
®
Head
position
(The
head
adjusting
plate
is
provided
to
adjust
the
tape
Head Adjusting Plate
adjustment touch of the head in cue or review mode.) Capstan ud
Condition:
1.
Press
the
playback
button
and
pause
button
—
a
*
Playback
and
pause
mode
2.
Measure
the
space
between
the
pressure
roller
and
the
Rs
capstan. (fe
Pressure Roller
Standard
value:
0.5+0.3mm
ve
Q
Space
(adjustable)
3.
If
the
measured
value
is
not
within
the
standard
value,
untighten
screw
(A),
and
slide
the
head
adjusting
plate
in
the
direction
of
arrow
(B)
for
adjustment
@
Head
azimuth
L-ch/R-ch
output
balance
adjustment
adjustment
1.
Make
connections
as
shown
in
fig.
4.
Condition:
* Playback mode
“VTVM. Os cilloscope
Playback mode
Small
hole
Equipment
2.
Playback
the
8kHz
signal
from
the
test
tape
(QZZCFM).
Fig.
4
*VTVM__
+
Oscilloscope
Adjust
screw
(B)
in
fig.
5
for
maximum
output
L-ch
and
Record/olavbadk
Please
use
non
metal
type
screwdriver
when
*
Test
tape
(azimuth)
R-ch
levels.
g
head
you
adjust
tape
speed
accuracy
on
this
unit.
»
QZZCFM
When
the
output
levels
of
L-ch
and
R-ch
are
not
at
maximum
at
the
same
time,
readjust
as
follows.
A
3.
Turn
the
screw
shown
in
fig.
5
to
find
angles
A
and
C
(points
where
peak
output
levels
for
left
and
right
channels
sue)
Fig.
1
are
obtained).
Then,
locate
the
angle
B
between
angles
A
Fig.
5
and
C,
i.e,
2
point
where
L-ch
and
R-ch
output
levels
come
Leh
peak
level
poh
peak
level
together
at
maximum.
(Refer
to
figs.
5
and
6.)
fi
-s <>
L-ch/R-ch phase adjustment
4. Make connections as shown in fig. 7.
5.
Playback
the
8kHz
signal
from
the
test
tape
(QZZCF™M).,
Adjust
screw
(B)
shown
in
fig.
5
so
that
pointers
of
the
two
VTVMs
swing
to
maximum
and
a
waveform
as
illustrated
in
Fig.
6
fig.
8
is
obtained
on
the
oscilloscope
>
wo exe
——_—>
ANGLE
Record/playback
Playback
mode TE
Fig. 7
Vertical Horizontal
Fig. 8
@
Tape
speed
Tape
speed
accuracy
Record/playback
head
LINE OUT 3
Condition:
1.
Test
equipment
connection
is
shown
in
fig.
9.
of)
*
Playback
mode
2.
Playback
test
tape
(QZZCWAT
3,000Hz),
and
supply
P|
_
=}
fo
i
Equipment: playback signal to frequency counter Test tape 'lavback mes Digital electronic counter
3.
Measure
this
frequency.
Fig.
9
* Digital electronic counter or
frequency
counter
4.
On
the
basis
of
3,000Hz,
determine
value
by
following
*
Test
tape
---
QZZCWAT
formula:
Tape
speed
accuracy
=
f -- 3,000
3,000
Take measurement at middie section of tape
VR1 R202
VR2 VR201 hic
x 100(%) where, f = measured value
Refer
to
@
Fluorescent
meter
at
page
6.
Standard value: +1.5%
Fig. 2
Adjustment method
1. Playback the test tape (middle).
2.
Adjust
so
that
frequency
becomes
3,000
Hz.
3.
Tape
speed
adjustment
VR
shown
in
fig.
1.

RS-M215
ITEM
MEASUREMENT
&
ADJUSTMENT
Tape speed fluctuation
Make measurements in same manner as above (beginning, middle and end of tape), and determine the
difference between maximum and minimum values and calculate as follows:
_ _ fi—fe
Tape speed fluctuation = 3,000 x 100 (%)
f; = maximum value, f2 = minimum value
| Standard value: Less than 1% |
Note:
Please use non metal type screwdriver when you adjust tape speed accuracy on this unit.
© Playback frequency
response
Condition:
* Playback mode
* Tape selector
--- Normal position
Equipment :
*VTVM — * Oscilloscope
* Test tape --- QZZCFM
1.
Test
equipment
connection
is
shown
in
Playback
frequency
response
chart
fig. 4.
2. Place UNIT into playback mode.
3. Playback the frequency response test
tape (QZZCFM).
4. Measure output level at 315Hz, 12.5kHz,
8kHz, 4kHz, 1kHz, 250Hz, 125Hz and
63Hz, and compare each output level
with the standard frequency 315Hz, at
LINE OUT.
5. Make measurement for both channels.
6. Make sure that the measured value is
within the range specitied in the frequency response chart (shown in fig. 10).
Fig. 10
@ Playback gain
Condition:
* Playback mode
* Tape selector
-+-Normal position
Equipment :
*VTVM_ * Oscilloscope
« Test tape ---QZZCFM
@ Erase current
Condition:
* Record mode
* Tape selector
--»Metal position
Equipment:
*VTVM * Oscilloscope
© Overall frequency
response
Condition:
* Record/playback mode
* Tape selector
«+ Normal position
«++ CrO2 position
-+- Metal position
* Input level controls --- MAX
1. Test equipment connection is shown in fig. 4.
2. Playback standard recording level portion on test tape (QZZCFM 315Hz), and using VTVM measure
the output level at LINE OUT.
3. Make measurement for both channels.
Standard value: 0.4V+1dB [around 0.42V: at test points TP5 (L-CH) and
TP6 (R-CH)]
Adjustment
1. If measured value is not within standard, adjust VR1 (L-CH), VR2 (R-CH) (See fig. 2 on page 3).
2. After adjustment, check “Playback frequency response” again.
1. Test equipment connection is shown in fig. 11.
2. Press the record and pause buttons.
3. Set the tape selector to metal position.
4. Read voltage on VTVM and calculate erase current by
following formula:
Erase head
‘2 Voltage across both ends of R101
1(Q) TP4
Standard value: 160139 ma (Metal position)
5. lf measured value is not within standard, adjust as follows.
Erase current (A
VTVM Oscilloscope
Fig. 11
Adjustment
1. Open the point (A) and short the point (B) on the main circuit board in the wiring connection diagram
(See page 8).
2. Make measurement for erase current.
3. Make sure that the measured value is within the erase current of 140mA to 170mA.
4. If it is beyond the value, carry out the following adjustments:
* If the erase current is less than 140 mA, short the point (A).
* If the erase current is more than 170mA, open the points (A) and (B).
Note 1: Overall frequency response chart (Normal)
Before measuring and adjusting, make sure of
the playback frequency response (For the
method of measurement, please refer to the
——-
Okt
Hz 4kHz 8kHz
+ +
1dBE~__10OH2z 200H2 — 500H2 "kHz AkHz BkHz B
playback frequency response). fe a at a Me “aye
Note 2: —AdBp---77 = tbt8
Test tape QZZCRA to be supplied after July —708
1980 has higher recording sensitivity in the
middle and high frequency range.

RS-M215
Equipment:
*VTVM * AF oscillator
* ATT * Oscilloscope
* Resistor (600 Q)
* Test tape
(reference blank tape)
+-+-QZZCRA for Normal
-+-QZZCRX for CrO2
--+QZZCRZ for Metal
MEASUREMENT & ADJUSTMENT
*
eae
This
chart
indicates
the
standard
values
for
the
new
type
of
QZZCRA
when
in
use.
*
eo)
This
chart
indicates
the
standard
values
for
the
former
type
of
QZZCRA
when
in
use.
—
The new type of QZZCRA is marked as shown in fig. 13.
New type
Qs
ZZCRAS
Former type
Overall
frequency
response
adjustment
by
recording
bias
current
Note 1:
On RS-M215, overall frequency response
is adjusted with tape selector set at Normal.
Note 2: <>}
6000, -
gs [O00]
ATT AF oscillator
eae (L-CH)
Record/playback fai
LINE IN
Recording equalizer is fixed. TP (L-CH)
the TP2(R-CH) Playback/ LIne UT
1. Make connections as shown in fig 14. R1 (L-CH) [= record mode
2. Input a 1kHz, —24 dB signal through R2 ne
roun
LINE IN. Place the set in record
mode.
3. Fine adjust the attenuator to obtain
0.4V LINE OUT output.
* Make sure that the input signal level
is —24+4dB with 0.4 V output
voltage.
. Set the tape selector to Normal, and load the test tape (QZZCRA).
. Adjust the attenuator to reduce the input signal level by 20 dB.
.
Adjust
the
AF
oscillator
to
generate
50Hz,
100Hz,
200Hz,
500Hz,
1
kHz,
4kHz,
8kHz
and
10kHz
signals,
and
record
these
signals
on
the
test
tape.
7,
Playback
the
signals
recorded
in
step
6,
and
check
if
the
frequency
response
curve
is
within
the
limits
shown in the overall frequency response chart for normal tapes (tig. 12).
(If
the
curve
is
within
the
charted
specifications,
proceed
to
steps
8,
9
and
10.)
If
the
curve
is
not
within
the
charted
specifications,
adjust
as
follows:
Adjustment @): Adjustment ®):
When
the
curve
exceeds
the
overall
frequency
When
the
curve
falls
below
the
overall
frequency
response
chart
specifications
(fig.
12)
as
shown
response
chart
specifications
(tig.
12)
as
shown
in fig. 15. in fig. 16.
VIVM os cilloscope
For overall frequency
response measurement.
3
VIVM oscilloscope
For bias current measurement.
Fig. 14
ome
== -b-----~ $-----~ +
2kHz 4kHz 8kHz
1) Reduce bias current by turning VR101 (L-CH)
and VR102 (R-CH).
2) Repeat steps 6 and 7 to confirm.
(Proceed to steps 8, 9 and 10 if the curve is
now within the charted specifications in fig.
12)
3) If the curve still falls below the charted
specifications (fig. 12), reduce bias current
further and repeat steps 6 and 7.
1) Increase bias current by turning VR101
(L-CH) and VR102 (R-CH).
(See fig. 2 on page 3.)
2) Repeat steps 6 and 7 to confirm.
(Proceed to steps 8, 9 and 10 if the curve
is now within the charted specifications in
fig. 12.)
3) If the curve still exceeds the specitications
(fig. 12), increase bias current further and
repeat steps 6 and 7.
8.
Switch
the
tape
selector
to
CrOz,
change
test
tape
to
QZZCRX,
and
record
50
Hz,
100
Hz,
200
Hz,
500Hz,
1
kHz,
4kHz,
8kHz,
10kHz
and
12.5kHz
signals.
Then,
playback
the
signals
and
check
if
the
curve
is
within
the
limits
shown
in
the
overall
frequency
response
chart
for
CrOz
0”B
tapes
(fig.
17).
Overall frequency response chart (CrOz, Metal)
100HZ 200Hz —_500Hz
4 Shaan poe

RS-M215 RS-M215
9. Switch the tape selector to Metal,
change test tape to QZZCRZ, and
record 50Hz, 100Hz, 200Hz, 500 Hz, 1 kHz, 4kKHz, 8kHz, 1OkKHz and 12.5kHz signals. Then,
playback the signals and check if the curve is within the limits shown in the overall frequency response
chart for metal tapes (fig. 17).
10. Confirm that bias currents are approximately as follows when the tape selector is set at different
positions.
ELECTRICAL PARTS LOCATION
E5
*
Read voltage on VTVM and calculate bias current by following formula:
Value read on VT VM (V)
10 (Q)
Bias current (A) =
around 410A (Normal position)
around 545A (CrO2 position) \ measured at TP1 (L-CH) and TP2 (R-CH)
around 800uA (Metal position)
@® Overall gain _ Test equipment connection is shown in fig. 18.
Condition: 2. Place UNIT into record mode, and tape selector to normal
Record/playback
head
i
* Record /playback mode position. :
+
Input
level
controls
---
MAX
3.
Supply
1kHz
signal
(—24
dB)
from
AF
oscillator,
through
pare
et
* Standard input level; ATT to LINE IN. ele LINE IN Tee MN” Test tape
MIC
«eeeeees
—72+4dB
4.
Adjust
ATT
unti!
monitor
level
at
LINE
OUT
becomes
Record/playbacky
ie
guy
LINE IN.-- -24+4¢B OAV. me
Equipment:
5.
Using
test
tape,
make
recording.
od
—fo
O_
7
=
VTVM
.
AE
cscillator
6.
Playback
recorded
tape,
and
make
sure
the
value
at
LINE
ie
tse
Playback
mode
yTym
Oscilloscope
i
Note:
Cord
connection
using
this
nylon
*
ATT
*
Oscilloscope
OUT
on
VTVM
becomes
0.4V.
Fig.
18
coupler
(E24)
requires
a
special
tool.
.
P
7.
If
measured
value
is
not
0.4,
adjust
VR5
(L-CH),
VR6
in
coupler
(E24)
* Resistor (600 Q)
* Test tape 8
(reference blank tape)
«++ QZZCRA for Normal
(R-CH) (See fig. 2 on page 3).
5
Nylon coupler .- Copper plate
.
Repeat
from
step
(2)
i
i (E24) ve Clamping
@
Fluorescent
meter
Note:
Condition:
RS-M215
cassette
decks
are
available
with
VR202
or
without
VR202.
For
models
with
VR202,
lighting
|
*
Record
mode
adjustments
at
—20dB
and
OdB
must
be
made.
For
those
without
VR202,
lighting
adjustment
is
* Input level controls --- MAX necessary only at OdB. If —20dB lighting adjustment is required for models without VR202, replace
* Tape selector R202 with an appropriate resistor.
- Normal position 1. Test equipment connection is shown in fig. 18.
Sees 2. Supply 1kHz signal (—24 dB) to the LINE IN then press the record button.
Se 3. Adjust the ATT so that the output level at LINE OUT becomes 0.4 V (The input level at this condition
*VTVM_ * AF oscillator ef id the’ standardinput level)
* ATT * Resistor (6002) fii nad ed tapas sro iat
4. Adjustment at “—20dB":
A. Adjust the ATT so that the input level is —20dB below standard recording level.
B. Adjust VR202 so that the —20dB segment -
lights
up
in
the
—20
+0.8dB
range
CL-CH
cS]
UVMAUEIUVTUTTITEELTITUET
TTT
TET
only)
(See
fig.
19).
wae
5, Adjustment at “OB”: a 74 2 29 00072 DE se at
A. Adjust the ATT so that the output level at Fig. 19
LINE
OUT
becomes
0.4
V.
A
LE
RL
Part
Name
&
Description
(The
input
level
at
this
condition
is
termed
shasesevaassana
sagen
saassvasss
taett
LOB)
DA
|SJASS
AG
Power
Gard
r
aT TCM
POUNPUNPUNP VAP UNE te
20
(FI)
6°4+2+0°*
2
O06
&
x For all European areas except United Kingdom.
B] A | QFC1205M "
% For United Kingdom. |
the standard input level.)
B. Adjust VR201 so that the +1dB segment
+ :
lights up in the 0 £0.2dB range of the Fig. 20 E? QTD1164 | Cord Clamper (for AC Power Cord)
standard input level (See fig. 20). Eg QTS1531 |Shield Plate
6. Repeat twice between steps (5) and (6) above. Seve (for AC Power Transformer)
7. Adjust ATT and check that all se ments li hts PI UTIUTAUIASEATELERAS ELS IASEEUSIEPIST Eri triers E9 XTN3+10B Screw 3X10
si L SHUNAUUUUTUNUT AUG U CHEAT UTLE REPEL ACEMENT. PARTS LIST. E10 |XTN3+16B Screw 43X16
up when an input signal level is increased to
10.dB higher than the standard input level (See 20 PEAR) 6 © 4+ 2+ 0° 2 10 <6 B= 11008)
fig. 21).
Important safety notice
Components identified by A, mark have special
characteristics important for safety.
When replacing any of these components, use
only manufacturer’s specified parts.
|
Ell XWG3 Washer
E12 XSN3+6S 'Screw H3X6
E13 XWA3B Washer
E14 QML3711 Recording Lever
ee ; ae dog: TPS (L-CH)
® Dolby NR circuit 1. Test equipment connection is shown in fig. 22. ICLL-CH) oe RCH) viv a E15 BS1132 Recording Wi
Condition:
2.
Place
UNIT
into
record
mode,
set
the
Dolby
NR
switch
ee
For
hare
eee
—
lei
sro
Pincord
iti
IN
to
obtain
E17
A
|
QTF1054
Fuse
Holder
+
Record
mode
to
OUT
position
and
supply
to
LINE
ETHICAL
PATS
NR switch --- IN/OUT —34.5dB at TPS (L-CH), TP6 (R-CH) (frequency oe eseparie oo ee lee
* Dolby NR switc /OU El QWwY4122z Record/Playback Head E19 QTS1532 Shield Case
« Input level controls --- MAX 5 kHz). AFostiator— ATT E2 QWY21382 Erase Head QMA4060 Volume Angle
; 3. Confirm that the value at IN position is 8(+2.5)dB £3 | OMA4061 Center Angle
Equipment : greater than the value at OUT position of Dolby NR . E4 QG01798 Push Button (for Power ON/OFF) |E21 QNQ1004 Nut
*VTVM + AF oscillator aiiteh Fig. 22 E5 QKJ0437 Cord Clamper (for Pin Cords) £22 QNQ1070 "
«ATT
*
Oscilloscope
,
Geis
“Silver
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E23
QJT1041
Check
Pin
*
Resistor
(600
Q)
QKJ0437K
»
A
|
QJT1079
Nylon
Coupler
“Black Type” |XTN3+12B ‘Screw 43X12 [6]

«Important
safety
notice
For
—20dB
Components
identified
by
A
mark
have
special
characteristics
important
for
safety.
indication
(FL
METER)
When
replacing
any
of
these
components,
use
only
manufacturer's
specified
parts.
adjustable
type.
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NOTES:
¢ $1-1—S1-4 ...... Record/Playback select switch (shown in playback position).
© $2-1—S2-2 ...... Input select switch (shown in LINE IN position).
* $3-1—S3-2 ...... Dolby IN/OUT select switch (shown in OUT position).
¢ $4-1—S4-5 ...... Tape select switch (shown in normal position).
AC power voltage select switch.
* For all European areas except United Kingdom.
Power ON/OFF switch (shown in OFF position).
Cue/Review muting switch (shown in off position).
0 SB. uiccetieosessnees Playback muting switch (shown in off position).
-Playback gain adjustment VR.
Input level controls.
© VR5,6 oo... Recording gain adjustment VR.
* VR101, 102 .Bias current adjustment VR.
e
VR201 0... FL meter adjustment VR (for OdB indication)
© VR202 ............ FL meter adjustment VR (for —20dB indication).
« Connection points (A) and (B)...... For erase current adjustment.
« Resistance are in ohms (Q), 1/4 watt unless specified otherwise.
K= 1,0002, M = 1,000KQ.
¢ Capacity are in microfarads («F) unless specified otherwise.
P = Pico-farads.
* The mark (¥) shows test point. e.g. ¥ = Test point 1.
* (==>) this arrow indicates the flow of the playback signal.
© (mmm ) this arrow indicates the flow of the recording signal.
* Ail voltage vatues shown in circuitry are under no signal condition and record mode
with volume control at minimum position.
For measurement, use VTVM.
¢ Important safety notice
Components identified by A mark have special characteristics important for safety.
When replacing any of these components, use only manufacturer's specified parts.
EQUIVALENT CIRCUIT
1C201 AN6870
i
@
Se
(TOP VIEW) 3
TRANSISTORS
|
ws
(SIDE
VIEW)
ws
(=
s
bax)
°
dia
8
c
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na
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Ic1, 2
DOLBY B-TYPE
CIRCUIT
INTEGRATED
W112 13141
SPECIFICATIONS — * Input level controls--- MAX.
Playback S/N ratio
Test tape --- QZZCFM
Greater than 45dB
(without NAB filter)
Overall distortion
Test tape
Less than 4%
*+»QZZCRA for Normal
+ QZZCRX for CrOz
++ QZZCRZ for Metal
Overall S/N ratio Greater than 43 dB
Test tape --- QZZCRA
NOTES: RESISTORS
ERD --- Carbon
ERG --- Metal-oxide
ERS --- Metal-oxide
ERO --- Metai-film
ERX --- Metal-film
ERQ---
ERC.
ERF..--
Solid
Cement
Fuse type metallic
CAPACITORS
ECBA ------ Ceramic
ECGO --.-- Ceramic
ECKO---.- Ceramic
ECC .--- Ceramic
ECF Ceramic
Polyester fiim
ECQE..-.--
Polyester
film
REPLACEMENT PARTS LIST
Important safety notice
ECQF
«++.
Polypropylene
ECEL
«-.--
Electrolytic
N.-... Non polar electrolytic
enka y Polystyrene
+ Tantalum
Tantalum
Components
identified
by
A
mark
have
special
characteristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
manufacturer's
specified
parts.
ERD25FJ681
R201 ‘ ERD25TJ153
R202. @ ' ERD25FJ472
For ali European areas
type.
R203, 204 | ERD25TJ683
R205, 206 | ERD25TJ473
R207, 208, 209
| ERD25TJ105
R211, 212 | ERD25FJ181
R213 ERD25FJ103
R214 _ERD25FJ681
RESISTORS
ERD25FJ100
R3,4 | ERD25FJ562
R5,6 ERD25TJ104
R7,8 ERD25FJ101
R9, 10 ERD25TJ104
R11,12 | ERD25TJ823
R13,14 ERD25FJ101
R15,16 | ERD25TJ184
R17,18 | ERD25FJ392
R19,20 | ERD25FJ272
R21,22 | ERD25FJ562
R23,24 | ERD25FJ332
R25,26 | ERD25TJ473
R27,28 | ERD25FJ392
R29,30 | ERD25FJ102
R31,32 | ERD25TJ474
R33, 34 | ERD25TJ473
R35,36 | ERD25FJ332
R37, 38 | ERD25TJ105
R39,40 | ERD25TJ274
R41,42 | ERD25TJ184
R43,44 | ERD25FJ181
R45,46 | ERD25FJ272
R47,48 | ERD25FJ102
R49,50 | ERD25TJ683
R51,52 | ERD25TJ224
R53,54 | ERD25FJ822
R55,56 ‘| ERD25FJ681
R57,58 | ERD25FJ272
R59,60 | ERD25FJ102
R61,62 | ERD25FJ471
R63,64 | ERD25TJ223
R65,66 | ERD25FJ102
R67,68 — ERD25FJ3R3
R69,70 | ERD25TJ333
R71,72 | ERD25TJ273
R73,74 | ERD25TJ124
R75,76 | ERD25FJ151
R77 ERG2ANJ560
R78 ERDSOFJ270
R79,80 | ERG12ANJ820
R81, 82 ERD25FJ102
R83, 84 ERD25FJ222
R85 ERD25FJ102
R90 ERD25TJ563
R93 ERD25FJ102
R94 ERD25TJ153
R95 ERD251J223
R101 ; ERD25FJ1RO
R102 ERD25FJ471
R103 ERD25FJ561
R104 ERD25FJ562
R105 ERD25FJ100
R106 ERD25FJ562
R107 ERD25FJ100
R108 ERDSOFJ101
R109 ERD25FJ101
R110 ERG2ANJ101
R112 ERD25FJ821
except United Kingdom.
* For —20dB indication (FL
METER) nonadjustable
QSSE203
$2,3 QES1544
$4 QES1490
S5 © A] QSR1409H
$6 A’ QSWI117
: QSB0251i
TL GA! QLPDS2EKC
A | QLPA61EKC
* For United Kingdom.
XBAQ0007
A
Ref. No. | Part No.
SWITCHES
VARIABLE i ECEAIAS101
RESISTORS | (67 ECEA2AS3R3
vR1,2 | EVNK4Aa00B24 |C69,70 | ECKD1H391KB
VR3,4 | QVH3AA067854 |C71 ECKD1H472MD
VR5,6 EVNK4AA00B54 For ~20dB indication (FL
VR101, 102 | EVNK4AA00B15, METER) adjustable type.
VR201 —/ EVNK4AAQ0B24 |C101,102 | ECCDIM101KD
VR202 EVNK4AA00B14 {C103 ECQP1183JZ
%For —20dB indication (FL | C104 ECFDD153KXY
METER) adjustable type. C105 ECEA1ES101
C106 ECFDD822KVY
SAPAGITORS §=— 10107, 108 | ECQV05104JZ
C1,2 ECEA25M4R7R 1C109,110 | ECEAICS471
C3,4 ECFOD102KVY |C111, 112
C5,6 ECFDD102KVY A | ECEAICS102
C7,8 | ECQM1H183KZ |C201,202 | ECEA2AS010
C9, 10 ECEAIHS100 | C203 ECFOD473KXY
11,12 | ECEAQUS471 —- C205, 206] ECKD1H223ZF
C13,14 | ECEA1ES220
C15,16 | ECKD2H121KBL | TRANSISTORS
C17,18 | ECFDDIOZKWY |Q1,2 2SB745T
C19,20 | ECEAIHNO10 = 03,4 2SD661T
€21,22 | ECFDD392KVY 05, 6,7,8,9, 10
C23,24 | ECQM1H472J2 | 2506368
C25,26 ECEALHS100 «013 2SB641R
(27,28 | ECQM1H273/z 015 2SD636S
29,30 | ECEASOMR33R | Q101 2SD592NCR
€31,32 | ECQVvO5104s2 + Q102 | 25C1846-R
C33,34 - ECEA1HS100 ‘| Q103 | 25A885-0
C35,36 | ECFDD473KXY
37,38 | ECQM1H562J2 Se iieas
39,40 | ECEA1HS100
C41, 42, 43, 44 MAI61
C45,46 | ECEA2ASO19 ~—-| 9102 RVDIN4748
C47,48 | ECEAIHS100 —_| 0103, 104, 105, 106
C49,50 | ECQM1H333JZ A|SM112
51,52 | ECFDDg22Kvy | 201,202 | MA161
C53,54 | ECFDD273Kxy_ | 9203 MA1047LF
(55,56 ECFDD333KXY | wwreGRaTED
(57,58 | ECEA1HNO10 CIRCUITS
C59,60 — : ECEA2ASO10
C61 | ECEALAS331 i : ce
C62 ECEAIASIOZ | coy Aiueda
ECKD1H2232F
For ail European areas except United Kingdom.
TRANSFORMER
For all European areas except United Kingdom.
Part Name & Description
Slide Switch
(Record/Playback Selector)
Lever Switch
(Input Selector and Dolby IN/OUT)
Lever Switch (Tape Selector)
Rotary Switch (AC Power Selector)
Push Switch (Power ON/OFF)
Leaf Switch
(Cue/Review and Playback Muting)
AC Power Transformer
”
COILS
L1,2 QLQX0343K ‘Bias Trap Coit
13,4 ! SLM1Z19 : MPX Filter Coil
L5,6 "QLQX0332K Peaking Coil
L101 , QLBO198K : Bias Oscillation Coil
JACKS
Jl | QUAO249C “Headphones Jack
12,3 QJA0257H Microphone Jack
J4 QJS1954H Record/Playback Socket
FUSES
Fuse (T 400mA)

8 1 6 5 4 3 2
CIRCUIT BOARD AND WIRING CONNECTION
poo i | $5: AC POWER VOLTAGE |
A
LINE OUT
P.
To MECHANISM CHASSIS TRANSFORMER OER LEE MSE ORME
<A
CIRCUIT
BOARD
;
a 8 _
For —20dB \ 0103 a102 a7 a13
indication (FL METER) NS alae fae BIR} 280638) FSBEAA)
adjustable type. XY ref tc Hf
‘\ fh S7: CUE/REVIEW = S8: PLAYBACK
Six : MUTING SWITCH MUTING SWITCH
RECORD/PLAYBACK
‘Y
05,6
=
Cte
TQ
cree
|
HEAD
<
ASP
8ahi)
5 5
----- B
GRY
%
S6: AC POWER
ON/OFF SWITCH |
S6: AC POWER ; * For United Kingdom
ON/OFF SWITCH .
“* For all European areas except United Kingdom
FL METER CIRCUIT BOARD C
it LY UNUM4556D
Fee) eet :
44
PSB IE TUN: D
co a ar
PSDGGUT), :
AN6807
ERASE HEAD
LED CIRCUIT BOARD NOTES:
i L. BLU--- Light Blue rea E
MAIN CIRCUIT BOARD i NIL «- No Color Mark For —20dB indication (FL METER)
A
'
|
ORG
.-.--
Orange
adjustable
type.
| CONNECTION POINT(A} PNK... Pink
A CONNECTION POINT(Bi aig RED .....- Red
LINE IN ENG \ } : P
28N6611T} 2SD592(NCA} SLD ..-..- Shield Wire
VLT .----- Violet
ie ---White
Yellow
NOTES:
© The circuit shown in seis on the conductor is +B (bias) circuit.
© The circuit shown in : on the conductor is —B (bias) circuit.
© The circuit shown in * "on the conductor side indicates printed circuit on the
back side of the printed circuit board.
¢ Values indicated in (__—} are DC voltage between the ground and electrical parts. F
¢ The voltage indicates are measured during record mode.